警报在android中不起作用？

我觉得我觉得非常微不足道.
基本上我在将来的某个特定时刻安排闹钟：

Intent contentIntent = new Intent(this, AlarmReceiver.class); 
PendingIntent theappIntent = PendingIntent.getService(Main.this, 0,contentIntent, 0); 
Calendar calendar = Calendar.getInstance();
calendar.set(year, month, day, hour,minute); 
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), theappIntent); 

移动设备不断开启时工作正常.
我的问题是重启移动设备后不会触发警报
并在预期时间开启.
我错过了什么吗？我应该做一些额外的工作来保持警惕
重启后安排？

解决方法:

您必须在设备启动时重置警报.
当设备启动并重置警报时,您将丢失以检测应用程序.以下是在清单中编写的代码

<receiver android:name=".YourReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
</receiver>

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

还要创建一个BroadcastReceiver来接收启动完成的意图

 public class YourReceiver extends BroadcastReceiver {


 Context ct;

 @Override
 public void onReceive(Context context, Intent intent) 
 {
    ct=context;
    if(intent.getAction().equals("android.intent.action.BOOT_COMPLETED"))
    {
      // Reset your alarm here
      Intent contentIntent = new Intent(ct, AlarmReceiver.class); 
      PendingIntent theappIntent = PendingIntent.getService(ct, 0,contentIntent, 0); 
      Calendar calendar = Calendar.getInstance();
      calendar.set(year, month, day, hour,minute); 
      AlarmManager am = (AlarmManager) ct.getSystemService(ALARM_SERVICE);
      am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), theappIntent); 
    }
 }

标签：android,android-alarms,alarmmanager
来源： https://codeday.me/bug/20191003/1850205.html